I was working with Arduino Duemilanove and Arduino 017 for two years. Now i have an arduino mega 2560, so i want to install the last Arduino IDE (22).

The problem is that with the new arduino will not work the previous working sketches that i have for duemilanove and IDE 17.

So i would like to know if i could have two IDE installed at the same windows xp computer in order to run version 17 when i will work with arduino duemilanove without to modify my working codes, and to run version 22 when i will work with mega 2560...

So, for the reply from Noorman, i understand that i could have multiple ide installed on the same computer, and from robtillaart, that (at least for the moment), including this simple command, i could use my old codes with the new version.

Thanks to both. I will start installing the new version and see if i could solve the problems. If not, i will report the error message. Thanks to all!

Mine were what were already installed. 0020 had a very short life and I moved directly from 0019 to 0021. 0022 has had a very long life, longer than all the other versions I've used (0014 onwards but not on this computer).